Suspended traveling blower for removing lint and the like from wall surfaces of textile mill rooms



Sept. 16, 1952 R. T. MOORE 2,610,349

SUSPENDED TRAVELING BLOWER FOR REMOVING LINT AND THE LIKE FROM WALL SURFACES OF TEXTILE MILL ROOMS Filed April 16, 1948 I 4 Sheets-Sheet 1 a a INVENTOR. T RALPH T. MOORE.

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ATTORNEY s Sept. 16, 1952 ra. T. MQORE 2,610,349

' SUSPENDED TRAVELING BLOWER FOR REMOVING LINT AND THE LIKE FROM WALL SURFACES OF TEXTILE MILL ROOMS Filed April 16, 1948 4 Sheets-Sheet 2 INVENTOR. RALPH T. MOORE.

Sept. 16, 1952 MOORE 2,610,349 SUSPENDED TRAVELING BLOWER FOR REMOVING LINT AND THE LIKE FROM WALL SURFACES 0F TEXTILE MILL ROOMS Filed April 16, 1948 4 Sheets-Sheet 3 INVENTOR. RALPH T. MOORE.

Segt. 16,

1952 R. T. MOORE SUSPENDED TRAVELING BLOWER FOR R LIKE FROM WALL SURFACES OF TEXTILE MILL R Filed April 16, 1948 INVENTOR. RALPH T- MOORE A TTOZFNEYS ute, with particularly good results having been obtained with a time cycle of 15 minutes and a blower speed of about 120 feet, when co-related with the other factors above mentioned. This blower speed is also desirable because it is a suitable speed at which to move aframe cleaner over spinning frames and the like.

The optimum co-relation of the foregoing factors is an air velocity of about 1200 feet per minute measured at a wall at a distance of about 16 feet from the blower, an included-angle between the air stream and the wall to be cleaned of about 40 and a 15 minute time cycle ofthe blower traveling at about 120 feet perminute when a smooth wallistobe cleaned. i

There are conditions under which it is desirable or even necessary that the. air stream be directed at a different angle to the path of travel of the blower in successive movements of the blower around the same course. One such condition is where the air stream delivered by the blower in one setting cannot effectively clean the ceiling above the aisles on opposite sides of a line of machines. 7 Unless the direction of the air stream is changed, parts of the ceiling will not be cleaned at all or all parts will not be cleaned to the desired extent. Another such condition is where there are side walls or other fixed vertical objects, such as posts, along the line of travel of the blower, and where the air stream from a single setting of. the blowerwill not effectively clean the fixed objects on both sides of the line of travel of the blower. V n I Underthese conditions it is desirable to shift the direction-of the air stream from time to time and apparatus is. provided by this inventionfor not only mash. but also automatic reciprocating of the blower step bystep between two extreme predetermined positionsto direct the air at various angles to the ;line of. travel of the apparatus. a A

A further understanding of the novel means of this invention .for carrying out this cleaning method may be gained byreferring to the accompanying drawings, in which: I Y I V V Fig. 1 is a side elevational viewof a self-propelling blower fan assembly embodying this in vention; j w I Fig. 2 in an-end elevational viewuvith'parts in section, of the. blower fan. of the -assembly of F .1;

Fig. 3 is a side elevational view, with partsin section, of the same blower fan assembly;

Fig. 4 is a plan viewof a bracket for securing together the body and thefan; hanger of the fan assembly of Fig.2;

Fig. 5 is a plan view of a portion of a bracket for securing together the fan hanger and the ring frame of theassembly of Fig. 2;

Fig. 6 is a plan view of a-trunnion fitting for engaging the bracket partially shown in Fig. 5;

Fig. '7 is a fragmentary side elevational view showing certain of the-parts of the apparatu of Fig. '1 together with automatic blower positioning meansr' y Fig. 8 is a transverse-sectional, view partlyin section taken on -line.88 oi-Fig. 7

Fig. 9 is a transverse vertical sectional view taken on line 9-9 of Fig. 7; and r Fig. 10 is a top plan'view partly in section taken on line Ill-I0 of Fig. '7,

The apparatus of thisinvention generally comprises an endless track, agself-propelled blower unit supported by the track, a propeller fan adapted to discharge a stream of air in the di- 4 rectlon of the surfaces to be cleaned, and means for driving the fan.

The illustrated apparatus more specifically includes an endless track T disposed below the ceiling to be cleaned, a blower unit B supported by the track T, a. propeller fan Fdisposed to discharge an air stream in a particular-direction and at a particular velocity, and a motor M for driving the fan.

The self-propelling blower unit B includes a mainframe lil andupwardly extending yokes l pivotally secured thereto. The supporting wheels I 2 are mounted on suitable bearings on yokes ll and contact members are adapted to engage a current conducting trolley wire I 3 which extends parallel to and above the track I 4 and may be suitablysupported in any convenient manner, as by hangers 15 secured to the ceiling. The driving motor is for the blower unit is vertically mounted on the frame l0 and is provided with a shaft which extends into a suitable gear box l9 from which a sprocket Zflis driven. ;A chain 2| extends fromthe sprocket. 20 to an upper sprocket 22 which is adapted to drive an upper drive wheel 23 preferably mounted on the same shaft as sprocket 22. This drive wheel is frictionally engagedwith the under side of the track T and propels the blower-unit along the track according to the dictates of motor 16. A propeller fan 25 is mounted on the upwardly extending end 25 of the shaft of the motor It to directa stream of air upwardly against the track and trolley wireimmediately above, thereby tomaintain the track and Wire substantially free of fly, etc.

The frame I I] is provided with a vertically disposed plate-like bracket 3! to which a box 32 housing control-mechanism, for themotors is and M .is attached by suitable means. A connecting bar 35 having apertured end portions is attached to the body, It by means of a pin 31 extending throughone of said apertures in bar 35 and engaging said body. The other end of the bar is likewise attached to the fan assembly by means ofapin 33. I

The fan assembly comprises a load bar 46 extendingsubstantially horizontally between .and connecting two upwardly extending wheel yokes 43 to which wheels 44 are attached bysuitable bearings.v The pin 38 is secured to oneend of said bar. The bar is .provided with a downwardly extending portion 45 having a threaded aperture, and in its middle portion defines a vertically disposed aperture. V

The propellerian F of this apparatus-is incorporated in an assembly depending from bar 40 and comprising a hanger 50, a ring frame 52 disposed aroundthe periphery of fan F, and an electric motor M secured to frame 52 and having a rotor shaft 54' keyedto the fan.

The hanger 5!! is tubular and of generally U- shape, and is normally disposed with end portions pointingdown, as shown in'Fig. 2. The top midportion ofthe hanger is provided with a platelike bracket 58 having a plurality of apertures 59 spaced around a arc in its outer edge portion, and having a knob-like pin 60 secured to the inner edge portion overthe hanger. The hanger is pivotally secured to load bar 40 by meansof a pair of blocks 62 adapted to cooperate'in engag-' ing pin.60 and by means of pins 63 disposed through said blocks and appropriateapertures in the sides of .bar 40. The hanger is secured in position relative to bar 4G'by means of astud 64 extending through one .of the apertures 599and threaded into the aperture 46 in portion 45. The

.-3 2 thrbuglnhanger. '5 lllto said motor.

endsofthehanger arefitted with-washers w se-1acured in place by. means of cotter pins extending throughi suitahlezltransverseapertures 6a inithe hangenib The .ring'. frame -52 comprises a metal sheet of frustoeconical': shapej-defining: an. inlet-:Venturi for'rfan'F. Frame 52 is disposed aroundlt-he per ripheryz'ofifan'F toguide air into .fan B; which: iS'ldiSpOSedli at: the. throat of .the Venturi; and is provided with-a fianged topiorleading, edge. Six

apertures :61" are: provided at substantially, ,d-ia

metrically opposite points in. groups. oLthree-in theisflanged-cportions; of the ring :frame; -A sheet metal .frame :68 rich-supporting: motoris se-= cured tot: the :f'rameri .52; extending across-i frame 521th a generally U-ashapediorm with end pore.-

- time; welded-;'*att:suhstantia1ly diametricalhnop;

positepoints onrframezfliz Asheet unetal member 6-9 )is .Z-secured at: its tends;:toithe'midssection. .of motorcframe'fw Band: to the portionxofr'iramef 52. adjacent theretct's Member :69 is included to crease:the:stability andiload carryingcapacity of frame 68axi 1 Motor-21M: isrdispcsed substantially at right angles: to' 'the plane EOfLIOt-filfib'ni :ofi'an E :an'dti's" secured'tdanfizsupported byframeBB. The rotor shaft 54- ='is :disposedz-cmaiially with fan; and isiikeyed thereto; wi Lines? 10? for I. delivering GIEC-r tricityito-rmotor 'M.'extend 'fromith'e contror box' The hangerrill and ring frame 52 are: securedlivering lament-streamed::the: required velocity; thezblo'werrunitrisstartedirupon its coursearound I the endlesstraclcrat a rate -.determined:.byi regur ceasedea the: manipulatediortthea electric tcurrentiflow into :the

l'ation; ofrthertcontrols; The blower unit isimaina tained in motion so long as cleaning ofgthe' ceil ing Jan'drupper wall portionsiiswrequired due. to cardirigs resulting; inxdispersioni of rfiyt, dust and lintcimrquantities-a suffici'entc'to require constant" ai'r agitation. :11Without:anyeattention;'the'blower unit 'tvill automaticallyz. travel the iendlessttrack continuously: for protracted: periods: soft time. Whemithe unit 21s. to: beastoppedi for inspection, service,:-:' 0 ""'because:icarding operations-thave' icontrolr lleversaxare appropriately V trolley lmesis cutoff.-

together v:forrotaticm of the :ring frame. relative tov the. hanger by? means. of a pair .of .trunnions Bland; atpair .cf :brackets 1 1:4 adapted to'b'e err-r ag-ed; with saidctrunnions. V Eachutrunni'on 'laiis v provided with-flan: aperture l 5 tto i're'ceive' an end: oL-theihanger and. withztarn ap'erture'fit extend:

ingi at' substantiallv.right :anglestto aperture-J5 V to receive a pin 1! disposed through amap'propriatei transverse aperture in a lowereendi' portier-rs.of".the .hanger; i-' The bracketstM are each provided. with athree. apertures ..forzregistry with the: apertures :25 1 anid are-secured; to the "ring" frame 25Zibytmea-nsmtpmst18; The. brackets are each: further: 'pr'ovide dewith an .enlarged portion lsw'havingca recess ior receivihgfioneztoftthe trumnionszi; A.;transizerse aperture tiais provided-Lin. eaewbracketito receive ta! set screw B3 to' prevent relativeiimovementisofiithe .bracket'iandz truhnion when: such: muvementzis; nutzdesired:

It will she zunderstoo'ds fromttl'le;.foregoingrdes scliption and the accompanying:drawingsttth'at the;- hangerimicincludesan intermediate portion and downwardly'extending end portions; all lying.

in a. verticalcpla neiiwitl'i. the:hanger :.being.:.supa

ported byt'thestrol'leyi'fcr" rotation: aboutqa ver ticalaraxi'sulying in:the;p1ane :of said ihanger; I As: shown Figure 3* aringis positionable paralleltoitand: at :onezsidetof :the" hanger plane and:.-has diametrically opposite :brackets': extendingi from the ringzitowardsithe trhanger aand oonnectedito the ".encirporti'onsi ofrzsth'ei. hanger: for: rotational movement aboutna' horizontal" axis? flying in: the; hanger .iplanezu. Thesrniotcrx is "supported: :by a frame: which; is; .conne'ctediltor; the :ringi andizis positioned: in": rlthezehangeroplanei Vandf iexten'dg' Lon either sidez-ithereofs and projects 1 beyondgioppo site: .sides of the hanger:plane 1 with the :;motor shattia'being substantially coaxial with the ring and'xextending: ..-towardsr' thezlringr and: Withxa f rustoconicaltwall. attached-5th 1' the-ring: extend? ingzzpast the; zfan: towards? the rhanger :when the partsare :positioned as; shown in Figure- :3. i

This: arrangement; of. parts results in a con-.-

struction' Whichis approximatelybalancede That Adiusmeltts 'ihithemosition; 'o'fiitheifan E fela-i tive toi load bar 40 andzthe :ceiling and walls of theiroom"toibeicleaned oysthe famima rbeimade byi raisinglior to theii hanger Also; by. loosening itsetz screws 83- -the. :fan'emawbe moved.- through substantially 360* with theiring iramezrelativeetdithehanger and by tightenmg the setlTscreWS" When-'the fan is ini'a predeterminedhpo'sition .frela-tive to the hangeix thetanimayibe fix'ecl in position .to direct air 1 at a: predetermined desired; angle to the hanger and wall: and ceiling surfaces Ito-be- .clearied In additiongby removing stud '64 from aperture 4 6 the hanger and fan may 'be moved relative to theloadLbar Ml through 180* in either rotatably mounted 'in loadbar 40; The hanger and fair m'ay b'efix'ed in anyone of three differ-- enup'ositio'ns relativeto"theceiling and wall portifo ns *to -be'"cleaned? by disposing 1 the pins TI through any" one of the apertures '66 and positioning stud-64f in* one of. 'theapertures 59 'in b'ra'cketifl andis'ecuring it in' the'aperture 46 in portion 45 orithelcadfbarfifl; as described.

, It is thus "clear: that the t novel ian'of this invention is rotatable through"'360 about each i of two diff erentaxes disposed at substantially right angles to each other and may be't'emporarilywsecurelyfixedin any One'of a variety of positions. relative to a .surfaceto be cleaned in accordance Withlthemethodroflthisinvention. 4 v Theiapparatus shown in. Figs. 7 to loii'nclu'q si've may "be generally .similar. to that shown in Fig. l but embodies means for automatically shif ting.the..'blower step {by step from a positiomto xdischargeau at an extremetangleuto one side of r the tracke to a corresponding extreme angle; on: th'e-.other side .of the tracker The apparatus of: these ifigures lcomprises a rail: T,-likethatoshown in Fig. 1, hanger to suspendthe tracki T from the: ceiling or an overhead 'supportiz and: a trolley assembly compris inga loadbar-Alli: wheel.- yokes=:-43 andiwheels: 4-4 which run omtheiloweriflan'ges of the rail T, and means such: asepinr 38-=i0r connecting; the assemvblyatewther;propellingr means; such: asnnit B .of Fig. ,1. Busibarsrtt are supportedaabove rail '1 lowerlhgttheirringrtr'ame 52 relative by insulators I 3a which are, hangers 85 and by a plate 85a.

The trolley load bar 40 carries two blocks 86 which are provided with a shouldered recess in which is retained a pin 81', to the lower end of which is connected a spacer block 88, from which is suspended a blower frame 50. This frame and the blower carried thereby, and its pertinent parts, may be the same as is shown inFigs. 2 and 3. 1 I The apparatus for shifting the position of the blower step by step comprises actuating mechanism disposed on one side of the rail, and actuated mechanism .carried by the load bar for movement by said actuating mechanism to shift the blower.

The actuating mechanism is illustrated in Figs. 7, 9 and 10. Itccmprises a plate 89 extending laterally fromsbus bar supporting plate 85a. At its outer end, plate 85 is attached to a vertical plate as which carries two .parallel verin turn, carried by tical tubes 9| in which rods -92,'connected at their lower ends to a cam or shoe &3, may slide vertically. Plate 90 is provided with an areshaped slot 94 to receive a pin which extends through a lever 96 pivoted on pin '91 carried by plate '00. Pin 95 is pivoted to the upper end of vertical lever 98 which is pivotally connected at' its lower end to cam or shoe 93. Spring '90, anchored to plate 00 and lever -96, serves to maintain pin 95 at either end of slot--94. In the position shown in Fig. 7, pin '95 is at the lower end of slot 94 and. shoe 93 is in a horizontal plane where it will engage with parts carried by the load bar. When the shoe 93 is lifted so that pin 05 is in the upper end of slot 94, the shoe will be out of possible contact with the blower frame shift means carried by the load bar. 'By reason of the location of spring 90 and its anchor points, the shoe may be maintained in either the upper or down position. I

The blower frame actuating means carried by the load bar includes the following parts: A pair of parallel upper and lower plates I00 extend laterally out from load bar on the side of the rail on which the actuating mechanism, above described, is positioned. A pin IOI extends vertically'through plates I00. Between these plates gear I02 is keyed to pin IOI while one end of lever 50-3 is rotatably mounted on that pin. Lever I03 has an upstanding post I04 at its free end and is there provided with a roller 505 which will engage with shoe 93 when the latter is in its lowermost position. Tension spring I00 is anchored at one end to upper plate I00 and at its other end it is anchored to dog I07 which is rotatably mounted on pin I08 carried by lever I03. Dog I01 is positioned beneath lever I03 in position to engage with the teeth of gear I02. An adjustable stop I 00 serves to limit the retracted position of lever I03 caused by contrac-- tion of spring I06.

At its lower end pin IOI is keyed to one end of a short lever I I0. A link I II is pivotally connected to the other end of lever H0 and is also pivotally connected to long lever II2 which is fixedly attached to filler block 88 about pin 0? of the blower frame. If desired, lever IIZ may be provided with depressions into which may project spring-pressed steel balls or pins carried in recess in load bar 40. Such apparatus is indicated diagrammatic-ally at H3 in Fig. 10. These 7 positioning means.

tained by this mechanism until subsequently shifted. a

The operation of the apparatus of Figs. 7 to 10 is quite like that of, the apparatus of Figs. 1 to 6, the main difference being in that the shifting is automatically performed. Assuming that the actuating mechanism is in the position shown in Figs. 7 and 10. i. e., with the shoe 93 in the same horizontal plan with roller I05, and also assuming that there is only one such actuating mechanism in a single endless loop of track, and assuming that the blower frame is being propelled along thetrack, it will be understood that the following operation takes place: When roller I05 contacts the shoe 93,. the roller runs along the shoe and gradually moves lever I03 and thereby rotates pin IOI and gear I02. Such movement also rotates short lever III] and moves linlr III and rotates long lever II2 upwardly (as viewed in Fig. 10) or toward the right (as viewed in Fig. 8). The extent to which lever I03 is moved by shoe '93 is suflicient to shift lever II 2 a predetermined number of degrees and to move one recess thereof away from contact with the positioning spring-pressed ball or pin and to bring the next recess into contact with such Coincident with this rota tional movement of lever II2, frame 50, and the fan carried thereby, is shifted to a corresponding extent. When roller I05 passes beyond shoe 03, spring I00 retracts lever I03 and dog I0! is retracted relative to gear I02 to engage the fol lowingtooth. The gear I02 and levers IIO, III and H2 remain in that actuated position until roller I05 again encounters shoe 03, whereupon the foregoing operation takes place. In this way the angle of the air stream to the rail is shifted one step for each time the device travels around the endless track.

It will be noted that the short lever. I I0, long lever H2 and link III are positioned relative to each other so that lever I I0 will make a half revolution while lever I I2 is moving from one to the-other of the two extreme positions illustrated in'Fig. l0, i. e., from an extreme position on one side of the center line of the track to a corresponding extreme position on the other side of the track. It follows, therefore, that during the second half revolution of lever [I0 the lever II2 will be retracted step by step. from its extreme position on the far side of the track to its original starting position.

Since the frame is actuated as just described, the direction of the stream of air delivered by the fan carried by that frame will likewise be shifted. It will be understood that in most cases it will be convenient and satisfactory to shift the blower frame from one position to r another position only once during the time the balls or pins and depressions serve to retain the blower, is traveling around a single looped track. However, the number of positions to which the blower frame may be shifted may be varied as desired and depending upon operating conditions. Ordinarily, six or eight different positions for the blower frame are suflicient. When the air stream is to be shifted from one extreme position where it makes an angle of 60 with a vertical wall on one side of the track to the other extreme position where it makes an angle of 60 with another vertical wall on the opposite side of the track, the angle between'these extreme positions is only .120" and the air stream can be shifted through that angularity ineight steps of 15 each or six steps of 20 each. Of course, it will'be under stood that the angularity of the air stream to actuating-mechanism may- 19.. vertical side walls nlay"be altered scribedand also gthat' the angulari ing maiy -be selected and change scribed. 'iBy using more than mechanism with one loop of track me be "shifted more frequently. l blowers' 'rnay be'used o 'n is' long enough to] k fans: desirable a'ndim t This' is a continuanon ln part ing'i application; Serial 707,964,

ber 1;1946, nowabandoned' Having thus described the present inventionet) It intern thatothers skilled'in the art may be able-to unat an. includedangle of between about?"iil anol about 60 with the surface being cleaned, means to shift the frame back and forth between two extreme predetermined positions, said means including actuating mechanism, positioned on one side of said track and actuated mechanism including a pivoted lever supported by the trolley and engageable with said actuating mechanism, a long lever fixed to said frame, and means for transmitting motion from the said pivoted lever to said long lever including a short lever actuated by said pivoted lever and a link connecting said long and short levers, a blower fan supported by the frame, said fan being tiltable on a horizontal axis between an upper extreme position above said horizontal axis and a lower extreme position, and means associated with said frame and fan to maintain the fan in a predetermined position between said upper and lower extreme positions. 2. Cleaning apparatus for use in cleaning wall surfaces in a textile mill comprising a trolley to run on an overhead track adjacent to the wall surfaces to be cleaned, a blower frame supported by said trolley and movable therewith along said track, said frame being adjustable about a vertical axis to direct an air stream against said wall surfaces to be cleaned ahead of the blower frame at an included angle of between about and about 60 with the surface being cleaned, means to rotate the blower frame stepwise to direct the airstream therefrom at different angles to the track, said means including a shoe positioned at one side of the track, a first lever fixedly secured to said frame, a second pivoted lever engageable with said shoe and means including a third lever shorter than said first lever and a link connected to said first and third'levers and operatively associated with said second lever for actuation thereby, a blower fan supported by the frame, said fan being tiltable on a horizontal axis between an upper extreme position above said horizontal axis and a lower extreme position, and means associated with said frame and fan to maintain the fan in a predetermined position between said upper and lower extreme positions.

3. Apparatus for removing lint and the like from the surfaces of side walls and ceilings of a textile mill room comprising a trolley to run on serving to direct air into said fan, and means for v rotating said hanger'step by step about a vertical axis through an angle of about said means comprising a lever connected to said hanger, a shorter lever, means rotatably supporting said shorter lever and supported rotatably by said trolley, a link connecting the free ends of said levers, and means for rotating said shorter lever successively through small angles less than about 120.

5. Apparatus for removing lint and the like from the surfaces of side walls and ceilings of a textile mill room comprising a trolley to run on an overhead track adjacent to at least one surface to be'cleaned, an inverted U-shaped hanger suspendedfrom said trolley and rotatable about a vertical axis, an annulus mounted in said hanger and rotatable about a horizontal axis, a motor, means within said annulus for supporting said motor with its shaft substantially coaxial with said annulus, a fan on the motor shaft and disposed within said annulus, said annulus serving to direct air into said fan, and means for rotating said hanger about a vertical axis through an angle of about 120, a bracket projecting laterally from said trolley, a lever connected to said hanger, a shaft rotatably carried by said bracket, a shorter lever keyed to said shaft, a link connecting the free ends of said levers, a gear keyed to said shaft, a lever rotatable about said shaft, and a dog carried by said last named lever and engageable with the teeth of said gear to rotate the gear when the last named lever is rotated in one direction.

6. Apparatus for removing lint and the like from the surfaces of the walls and ceilings of textile mill rooms comprising trolley means to run on an overhead track adjacent to at least one surface to be cleaned, an inverted U-shaped hanger including an intermediate portion and downwardly extending end portions lying in a vertical plane, means connecting substantially the midpoint of said intermediate portion to said trolley means for rotational movement of the hanger about a vertical axis lying in said plane, a ring positionable on one side of and parallel to said hanger, pivots connecting said brackets to said hanger for rotation about a horizontal'axis in the plane 'of the latter, means for securing the brackets in a selected position of adjustment about saidaxis, a motor support frame connected tosaid ring, .a motor on said frame within and pro jectingfb'eyond opposite sides of said hanger plane and having its shaft substantially coaxial with said ringfand ex'tendingtoward the plane of said ring, a fan on saidshaft adjacentto said ring, a frusto-conical wall attached to said ring and extending pastsaid fan toward the hanger planetodirect 'airf'into said fan, and means for rotatingsaid hanger about said vertical axis including a member operatively associated with said hanger and engageablewith an abutment fixed in position adjacent to said track.

7.. Apparatus for removing lint and the like from the surfaces of side walls and ceiling of a textile mill room comprising wheels arranged in pairs to run onvan overhead track adjacent to at least one surface to be cleaned, a yoke depending from and connecting each pair of Wheels and a load bar connecting said yokes and carrying a pair of bearing blocks, having their opposed sur-' faces recessed to receive and support a headed member; aninverted U-shapedhangfl having a headed member projectingj from its jmidportion upwardly between said bearing blocks in said re.

cess and supported'by said 'blocksfor rotation about a vertical axis, anannulus, bearing means connecting the end portions of said hanger to opposite sides of said annulus for rotation of the latter about a horizontal axis, amotor, means connected to said annulus adjacent to said bearing means for supporting said motorrwith its shaft substantially coaxial with said annulus, and a fan 'on the motor shaft, disposedv within said annulus, the latter serving to direct air into said fan. a

- RALPH T. MOORE.

. REFERENCES CITED The following references are of record in the file of this patent: V

UNITED STATES PATENTS. Number I ;Name Date 829,319. Cessna Aug. 21, 1906 1,339,182 'Farrell May 4, 1920 1,517,961, Cummings Dec. 2, 1924 2,179,976 Easley NOV. 14, 1939 2,183,758 -Walker Dec; 19, 1939 2,225,406 Anderson Dec. 17, 1940 

